well, a miniseries as i define it is usually a shorter number of episodes, like 6-15. the series also usually ends after one season, or an intended short run of just a couple seasons, intentionally so. firefly is different as sci-fi pulled it after some dispute. for example, band of brothers is i beleive 6 or 8 one hour episodes. idk, i guess im really just interested in finding out about song of fire and ice.
Actually iirc Firefly was cancelled by Fox, to make way for some new crappy reality show and/or offensive sit-com. Man I hate Fox. I haven’t heard anything about a George RR Martin mini series, that could be interesting but I fear that it could be a really ham-fisted Sci-Fi channel-type affair. If HBO did it, and it turned out like Rome, it could be awesome - but I’m concerned about having my enjoyment of the books tarnished by bad writing/acting/casting/cgi. Also, so much happens in those books that I dunno how a tv adaptation would be feasible.